<body class="text-center">
<div class="cover-container d-flex w-100 h-100 p-3 mx-auto flex-column">
    <header class="masthead mb-auto">
      <div class="inner">
        <h3 class="masthead-brand">Cover</h3>
        <nav class="nav nav-masthead justify-content-center">
          <a class="nav-link active" href="#">Home</a>
          <a class="nav-link" href="#">Features</a>
          <a class="nav-link" href="#">Contact</a>
        </nav>
      </div>
    </header>
  
    <main role="main" class="inner cover">
      <h1 class="cover-heading">Cover your page.</h1>
      <p class="lead">Cover is a one-page template for building simple and beautiful home pages. Download, edit the text, and add your own fullscreen background photo to make it your own.</p>
      <p class="lead">
        <a class="btn btn-danger btn-lg btn-block"
        [routerLink]="['/']" (click)="logout()">退出</a>
      </p>
    </main>
  
    <footer class="mastfoot mt-auto">
      <div class="inner">
        <p>Cover template for <a href="https://getbootstrap.com/">Bootstrap</a>, by <a href="https://twitter.com/mdo">@mdo</a>.</p>
      </div>
    </footer>
  </div>
</body>